<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>

<script type="text/javascript">


var a = [1,2,3];
a.b = 20;
a.c = function(){
	alert(this);
};
a.c();
//var a = new Object();
/*
a=10;
a.b = 20;
alert(typeof a);
*/
//alert(typeof a)

</script>
</body>
</html>